Abstract
Climate change damage induced by growing carbon dioxide (CO2) emissions has rapidly fostered research on capturing, utilizing, and converting CO2 into valuable C1 and C2 chemicals. In particular, electrochemical reduction of CO2 into formic acid and ethylene is a promising way to recycle the wasted CO2 gas, provided that this process is environmental sustainable and economic feasible compared to conventional processes. Here we review electrocatalysts for the production of formic acid and ethylene by electrochemical CO2 reduction. We discuss the optimization of catalysts by structural engineering, construction of metal alloys, development of metal and non-metal composites, defect engineering single-atom catalyst schemes, and metal-functional polymers. We also present life cycle and economic assessments of electrochemical CO2 reduction. Actually, due to the lack of material recycling, and to disadvantages of high electricity consumption, insufficient catalytic performance, and durability, current electrochemical CO2 reduction is still inferior to the conventional process.
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References
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Funding
The authors would like to acknowledge the financial support provided by the Ministry of Higher Education (MOHE) Malaysia under the Fundamental Research Grant Scheme (FRGS) (Ref no: FRGS/1/2020/TK0/XMU/02/1) and also Guangdong Basic and Applied Basic Research Foundation (Ref no: 2021A1515111019). This work is also funded by Xiamen University Malaysia Investigatorship Grant (Grant no: IENG/0038), Xiamen University Malaysia Research Fund (XMUMRF/2021-C8/IENG/0041 and XMUMRF/2019-C3/IENG/0013), and Hengyuan International Sdn. Bhd. (Grant no: EENG/0003).
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Ling Ai performed writing—original draft preparation, and formal analysis. Sue-Faye Ng performed writing—original draft preparation, and writing—review and editing. Wee-Jun Ong contributed to conceptualization, supervision, writing-review and editing, project administration, and funding acquisition.
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Ai, L., Ng, SF. & Ong, WJ. Carbon dioxide electroreduction into formic acid and ethylene: a review. Environ Chem Lett 20, 3555–3612 (2022). https://doi.org/10.1007/s10311-022-01470-5
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DOI: https://doi.org/10.1007/s10311-022-01470-5